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## Rails 6.0.0.beta3 (March 11, 2019) ##
-* No changes.
+* Only accept formats from registered mime types
+
+ A lack of filtering on mime types could allow an a attacker to read
+ arbitrary files on the target server or to perform a denial of service
+ attack.
+
+ Fixes CVE-2019-5418
+ Fixes CVE-2019-5419
+
+ *John Hawthorn*, *Eileen M. Uchitelle*, *Aaron Patterson*
## Rails 6.0.0.beta2 (February 25, 2019) ##